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通过真三轴试验模拟基坑开挖过程中侧向卸荷土体的应力路径,针对武汉地区具有代表性的粉质粘土,进行了一系列真三轴排水和不排水固结剪切试验。试验分析结果表明,真三轴卸荷不排水试验的应力—应变关系曲线不符合Duncan-Zhang模型,但该试验曲线在低围压下基本符合Lade-Duncan弹塑性模型,在高围压下偏差较大;而卸荷排水试验的应力—应变关系曲线与不排水条件下Lade-Duncan弹塑性模型曲线吻合较好。由于排水试验耗时较长,因此在卸荷排水条件下的实际工程可以用不排水试验来代替,以便缩短试验时间。本文研究成果为进一步在该方面的研究和工程应用提供参考。
Through the true triaxial test simulating the stress path of lateral unloading soil during excavation, a series of true triaxial drainage and undrained consolidation shear tests were carried out for the representative silty clay in Wuhan. The test results show that the stress-strain curve of undrained true triaxial unloading test does not accord with Duncan-Zhang model, but the test curve is basically consistent with Lade-Duncan elasto-plastic model under low confining pressure. Under high confining pressure, While the stress-strain curve of the unloading and drainage test is in good agreement with the Lade-Duncan elasto-plastic model under undrained condition. As the drainage test takes a long time, the actual project under the condition of unloading and drainage can be replaced by the non-drainage test in order to shorten the test time. The research results of this paper provide references for further research and engineering application in this field.